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          <h1 class="post-title" itemprop="name headline">libiop通讯流程和api讲解</h1>
        

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        <p>上一篇讲到了<code>libiop基本结构</code>,这次根据libiop提供的test跟踪下消息和运行流程</p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">echo_server_test</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">int</span> keepalive_timeout = <span class="number">60</span>;</span><br><span class="line">    <span class="keyword">iop_base_t</span> *base = iop_base_new(<span class="number">10240</span>);</span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">"create a new iop_base_t object.\n"</span>); </span><br><span class="line">    iop_add_tcp_server(base,<span class="string">"0.0.0.0"</span>,<span class="number">7777</span>,</span><br><span class="line">        my_echo_parser,my_echo_processor,</span><br><span class="line">        my_echo_on_connect,my_echo_on_destroy,my_echo_on_error,</span><br><span class="line">        keepalive_timeout);</span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">"create a new tcp server on port 7777.\n"</span>);</span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">"start iop run loop.\n"</span>);</span><br><span class="line">    iop_run(base);</span><br><span class="line">    </span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p><code>echo_server_test</code> 函数内部添加了一个tcpserver,将函数一层一层展开,展开<code>iop_add_tcp_server</code><br><a id="more"></a><br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">iop_add_tcp_server</span><span class="params">(<span class="keyword">iop_base_t</span> *base, <span class="keyword">const</span> <span class="keyword">char</span> *host, <span class="keyword">unsigned</span> <span class="keyword">short</span> port,</span></span></span><br><span class="line"><span class="function"><span class="params">                       iop_parser parser, iop_processor processor,</span></span></span><br><span class="line"><span class="function"><span class="params">                       iop_cb on_connect,iop_cb on_destroy,</span></span></span><br><span class="line"><span class="function"><span class="params">                       iop_err_cb on_error, <span class="keyword">int</span> keepalive_timeout)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    </span><br><span class="line">    <span class="keyword">iop_tcp_server_arg_t</span> *sarg = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">io_handle_t</span> h = INVALID_HANDLE;</span><br><span class="line">    sarg = (<span class="keyword">iop_tcp_server_arg_t</span> *)<span class="built_in">malloc</span>(<span class="keyword">sizeof</span>(<span class="keyword">iop_tcp_server_arg_t</span>));</span><br><span class="line">    <span class="keyword">if</span>(!sarg)&#123;<span class="keyword">return</span> <span class="number">-1</span>;&#125;</span><br><span class="line">    <span class="built_in">memset</span>(sarg,<span class="number">0</span>,<span class="keyword">sizeof</span>(<span class="keyword">iop_tcp_server_arg_t</span>));</span><br><span class="line">    h = iop_tcp_server(host,port);</span><br><span class="line">    <span class="keyword">if</span>(h == INVALID_HANDLE)&#123;<span class="keyword">return</span> <span class="number">-1</span>;&#125;</span><br><span class="line">    sarg = (<span class="keyword">iop_tcp_server_arg_t</span> *)<span class="built_in">malloc</span>(<span class="keyword">sizeof</span>(struct <span class="keyword">tag_iop_tcp_server_arg_t</span>));</span><br><span class="line">    <span class="keyword">if</span>(!sarg)</span><br><span class="line">    &#123;</span><br><span class="line">        iop_close_handle(h);</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">    &#125;</span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifdef</span> WIN32</span></span><br><span class="line">    strcpy_s(sarg-&gt;host,<span class="keyword">sizeof</span>(sarg-&gt;host)<span class="number">-1</span>, host);</span><br><span class="line"><span class="meta">#<span class="meta-keyword">else</span></span></span><br><span class="line">    <span class="built_in">strcpy</span>(sarg-&gt;host,host);</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line">    sarg-&gt;port = port;</span><br><span class="line">    sarg-&gt;timeout = keepalive_timeout;</span><br><span class="line">    sarg-&gt;on_connect = on_connect;</span><br><span class="line">    sarg-&gt;on_destroy = on_destroy;</span><br><span class="line">    sarg-&gt;on_error = on_error;</span><br><span class="line">    sarg-&gt;parser = parser;</span><br><span class="line">    sarg-&gt;processor = processor;</span><br><span class="line">    _list_add_before(base-&gt;tcp_protocol_list_head, _list_node_new(sarg));         </span><br><span class="line">    <span class="keyword">return</span> iop_add(base,h,EV_TYPE_READ,_iop_tcp_server_cb,(<span class="keyword">void</span> *)sarg,<span class="number">-1</span>);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>解读<code>iop_add_tcp_server</code>,函数参数<code>iop_base_t</code> 是<code>iop基本事件结构</code>，前面有说过， </p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">tag_iop_base_t</span></span></span><br><span class="line"><span class="class">&#123;</span></span><br><span class="line">    <span class="keyword">iop_t</span> *iops;        <span class="comment">/*所有iop*/</span></span><br><span class="line">    <span class="keyword">int</span> maxio;            <span class="comment">/*最大并发io数,包括定时器在内*/</span></span><br><span class="line">    <span class="keyword">int</span> maxbuf;            <span class="comment">/*单个发送或接收缓存的最大值*/</span></span><br><span class="line">    <span class="keyword">int</span> free_list_head;    <span class="comment">/*可用iop列表*/</span></span><br><span class="line">    <span class="keyword">int</span> free_list_tail; <span class="comment">/*最后一个可用iop*/</span></span><br><span class="line">    <span class="keyword">int</span> io_list_head;    <span class="comment">/*已用io类型的iop列表*/</span></span><br><span class="line">    <span class="keyword">int</span> timer_list_head;    <span class="comment">/*已用timer类型的iop列表*/</span></span><br><span class="line">    <span class="keyword">int</span> connect_list_head;  <span class="comment">/*异步连接的iop列表*/</span></span><br><span class="line">    <span class="keyword">volatile</span> <span class="keyword">int</span> exit_flag;    <span class="comment">/*退出标志*/</span></span><br><span class="line"></span><br><span class="line">    <span class="keyword">int</span> dispatch_interval;        <span class="comment">/*高度的间隔时间*/</span></span><br><span class="line">    <span class="keyword">iop_op_t</span> op_imp;           <span class="comment">/*事件模型的内部实现*/</span></span><br><span class="line">    <span class="keyword">void</span> *model_data;         <span class="comment">/*事件模型特定的数据*/</span></span><br><span class="line"></span><br><span class="line">    <span class="keyword">iop_time_t</span> cur_time;        <span class="comment">/*当前调度时间*/</span></span><br><span class="line">    <span class="keyword">iop_time_t</span> last_time;        <span class="comment">/*上次调度时间*/</span></span><br><span class="line">    <span class="keyword">iop_time_t</span> last_keepalive_time; <span class="comment">/*上次检查keepalive的时间*/</span></span><br><span class="line"></span><br><span class="line">    <span class="keyword">_list_node_t</span> * tcp_protocol_list_head;    <span class="comment">/*use for advance tcp server model.*/</span></span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
<p>第二个参数<code>host是主机地址</code>，<code>port是端口号</code>，剩下的<code>parser为解析函数指针</code>,<code>processor为处理函数指针</code>，<code>on_connect为连接的回调函数指针</code>，`on_destroy,为</p>
<p>销毁功能函数指针<code>，</code>on_error为错误情况下函数指针<code>，</code>keepalive_timeout为超时时间`</p>
<p>这几个函数指针的类型如下，基本都类似的</p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/*tcp连接事件回调函数*/</span></span><br><span class="line"><span class="function"><span class="keyword">typedef</span> <span class="title">void</span> <span class="params">(*iop_cb)</span><span class="params">(<span class="keyword">iop_base_t</span> *,<span class="keyword">int</span>,<span class="keyword">void</span> *)</span></span>;</span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">iop_default_cb</span><span class="params">(<span class="keyword">iop_base_t</span> *base, <span class="keyword">int</span> id, <span class="keyword">void</span> *arg)</span></span>;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment">*   返回-1代表要删除事件,返回0代表不删除</span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"><span class="function"><span class="keyword">typedef</span> <span class="title">int</span> <span class="params">(*iop_err_cb)</span><span class="params">(<span class="keyword">iop_base_t</span> *,<span class="keyword">int</span>,<span class="keyword">int</span>,<span class="keyword">void</span> *)</span></span>;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">iop_default_err_cb</span><span class="params">(<span class="keyword">iop_base_t</span> *base, <span class="keyword">int</span> id, <span class="keyword">int</span> err, <span class="keyword">void</span> *arg)</span></span>;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/************************************</span></span><br><span class="line"><span class="comment">*协议解析器，</span></span><br><span class="line"><span class="comment">* parameters:</span></span><br><span class="line"><span class="comment">*    char *buf:数据</span></span><br><span class="line"><span class="comment">*    int len:数据长度</span></span><br><span class="line"><span class="comment">*return:</span></span><br><span class="line"><span class="comment">*    返回0代表还要收更多数据以代解析，-1代表协议错误，&gt;0代表解析成功一个数据包</span></span><br><span class="line"><span class="comment">***********************************/</span></span><br><span class="line"><span class="function"><span class="keyword">typedef</span> <span class="title">int</span> <span class="params">(*iop_parser)</span><span class="params">(<span class="keyword">char</span> *, <span class="keyword">int</span>)</span></span>;</span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">iop_default_parser</span><span class="params">(<span class="keyword">char</span> *buf, <span class="keyword">int</span> len)</span></span>;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment">*数据处理器</span></span><br><span class="line"><span class="comment">*parameters:</span></span><br><span class="line"><span class="comment">*    base:iop_base_t 指针</span></span><br><span class="line"><span class="comment">*    id:iop对象的id</span></span><br><span class="line"><span class="comment">*    buf:数据包起始点</span></span><br><span class="line"><span class="comment">*    len:数据包长度</span></span><br><span class="line"><span class="comment">*    arg:自带的参数</span></span><br><span class="line"><span class="comment">*return:</span></span><br><span class="line"><span class="comment">    -1: 代表要关闭连接,0代表正常</span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"><span class="function"><span class="keyword">typedef</span> <span class="title">int</span> <span class="params">(*iop_processor)</span><span class="params">(<span class="keyword">iop_base_t</span> *,<span class="keyword">int</span>,<span class="keyword">char</span> *,<span class="keyword">int</span>,<span class="keyword">void</span> *)</span></span>;</span><br></pre></td></tr></table></figure>
<p>回到<code>iop_add_tcp_server函数</code>里 </p>
<p>开辟arg的空间</p>
<p><code>sarg = (iop_tcp_server_arg_t *)malloc(sizeof(iop_tcp_server_arg_t));</code><br>绑定端口和地址</p>
<p><code>h = iop_tcp_server(host,port);</code><br>对arg赋值<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">sarg-&gt;port = port;</span><br><span class="line">    sarg-&gt;timeout = keepalive_timeout;</span><br><span class="line">    sarg-&gt;on_connect = on_connect;</span><br><span class="line">    sarg-&gt;on_destroy = on_destroy;</span><br><span class="line">    sarg-&gt;on_error = on_error;</span><br><span class="line">    sarg-&gt;parser = parser;</span><br><span class="line">    sarg-&gt;processor = processor;</span><br></pre></td></tr></table></figure></p>
<p>下面这句代码最重要</p>
<p><code>iop_add(base,h,EV_TYPE_READ,_iop_tcp_server_cb,(void *)sarg,-1);
这句代码将socket h绑定了一个读事件，当有读事件就绪时会触发iop_tcp_server_cb这个函数</code>。</p>
<p>如何将h和iop_tcp_server_cb绑定的，展开iop_add</p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">iop_add</span><span class="params">(<span class="keyword">iop_base_t</span> *base,<span class="keyword">io_handle_t</span> handle,<span class="keyword">unsigned</span> <span class="keyword">int</span> events,iop_event_cb evcb,<span class="keyword">void</span> *arg,<span class="keyword">int</span> timeout)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">int</span> r = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">iop_t</span> *iop = _iop_base_get_free_node(base);</span><br><span class="line">    <span class="keyword">if</span>(!iop)&#123;<span class="keyword">return</span> <span class="number">-1</span>;&#125;</span><br><span class="line">    iop-&gt;handle = handle;</span><br><span class="line">    iop-&gt;events = events;</span><br><span class="line">    iop-&gt;timeout = timeout;</span><br><span class="line">    iop-&gt;evcb = evcb;</span><br><span class="line">    iop-&gt;last_dispatch_time = base-&gt;cur_time;</span><br><span class="line">    iop-&gt;arg = arg;</span><br><span class="line">    <span class="comment">//io 事件</span></span><br><span class="line">    <span class="keyword">if</span>(handle != INVALID_HANDLE)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="comment">//LOG_DBG("iop_add io, id=%d.\n", iop-&gt;id);</span></span><br><span class="line">        iop-&gt;prev = <span class="number">-1</span>;</span><br><span class="line">        iop-&gt;next = base-&gt;io_list_head;</span><br><span class="line">        base-&gt;io_list_head = iop-&gt;id;</span><br><span class="line">        iop-&gt;iop_type = IOP_TYPE_IO;</span><br><span class="line">            iop_set_nonblock(handle);</span><br><span class="line">        r = (*(base-&gt;op_imp.base_add))(base, iop-&gt;id, handle, events);</span><br><span class="line">        <span class="keyword">if</span>(r != <span class="number">0</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            iop_del(base,iop-&gt;id);</span><br><span class="line">            <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">else</span></span><br><span class="line">    &#123;</span><br><span class="line">        <span class="comment">/*timer*/</span></span><br><span class="line">        <span class="comment">//LOG_DBG("iop_add timer, id=%d.\n", iop-&gt;id);</span></span><br><span class="line">        iop-&gt;prev = <span class="number">-1</span>;</span><br><span class="line">        iop-&gt;next = base-&gt;timer_list_head;</span><br><span class="line">        base-&gt;timer_list_head = iop-&gt;id;</span><br><span class="line">        iop-&gt;iop_type = IOP_TYPE_TIMER;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> iop-&gt;id;    </span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>iop_add 形参不做解释，其中形参evcb也是函数指针</p>
<p><code>/*事件回调函数,返回-1代表要删除对象,返回0代表正常*/
typedef int (*iop_event_cb)(iop_base_t *,int,unsigned int,void *);</code><br><code>在iop_add内部完成iop回调函数evcb的绑定和基本参数赋值,然后判断是io事件还是定时器事件,对于IO事件，要通知网络层(epoll,select等不同模型)进行绑定，
调用base中op_imp成员的base_add函数指针完成绑定。</code></p>
<p><code>r = (*(base-&gt;op_imp.base_add))(base, iop-&gt;id, handle, events);</code><br>之所以能调用是因为之前op_imp.base_add被赋值了。回到<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">echo_server_test</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">int</span> keepalive_timeout = <span class="number">60</span>;</span><br><span class="line">    <span class="keyword">iop_base_t</span> *base = iop_base_new(<span class="number">10240</span>);</span><br><span class="line">        ...</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">iop_base_t</span>* iop_base_new(<span class="keyword">int</span> maxio)</span><br><span class="line">&#123;</span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifdef</span> _HAVE_EVENT_PORTS_</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifdef</span> _HAVE_WORKING_KQUEUE_</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifdef</span> _HAVE_EPOLL_</span></span><br><span class="line">    <span class="keyword">return</span> iop_base_new_special(maxio,<span class="string">"epoll"</span>);</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifdef</span> _HAVE_DEVPOLL_</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifdef</span> _HAVE_POLL_</span></span><br><span class="line">    <span class="keyword">return</span> iop_base_new_special(maxio,<span class="string">"poll"</span>);</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifdef</span> _HAVE_SELECT_</span></span><br><span class="line">    <span class="keyword">return</span> iop_base_new_special(maxio,<span class="string">"select"</span>);</span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line">    <span class="keyword">return</span> <span class="literal">NULL</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>一层一层看</p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">iop_base_t</span>* iop_base_new_special(<span class="keyword">int</span> maxio,<span class="keyword">const</span> <span class="keyword">char</span> *model)</span><br><span class="line">&#123;</span><br><span class="line">    <span class="keyword">int</span> r = <span class="number">-1</span>;</span><br><span class="line">    <span class="keyword">iop_base_t</span> *base = <span class="literal">NULL</span>;</span><br><span class="line">    <span class="keyword">if</span>(<span class="built_in">strcmp</span>(model,<span class="string">"epoll"</span>)==<span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        base = _iop_base_new(maxio);</span><br><span class="line">        <span class="keyword">if</span>(base)</span><br><span class="line">        &#123;</span><br><span class="line">            r = iop_init_epoll(base, maxio);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">        ......  </span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">iop_init_epoll</span><span class="params">(<span class="keyword">void</span> *iop_base, <span class="keyword">int</span> maxev)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    ...</span><br><span class="line">    <span class="comment">//模型内部实现，不同模型不同的函数指针和名字</span></span><br><span class="line">    iop_op-&gt;name = <span class="string">"epoll"</span>;</span><br><span class="line">    iop_op-&gt;base_free = epoll_free;</span><br><span class="line">    iop_op-&gt;base_dispatch = epoll_dispatch;</span><br><span class="line">    iop_op-&gt;base_add = epoll_add;</span><br><span class="line">    iop_op-&gt;base_del = epoll_del;</span><br><span class="line">    iop_op-&gt;base_mod = epoll_mod;</span><br><span class="line">    </span><br><span class="line">    <span class="comment">//1024 is not the max events limit.</span></span><br><span class="line">    <span class="comment">//创建epoll表句柄</span></span><br><span class="line">   ...</span><br><span class="line">    <span class="comment">//iop_epoll_data_t类型的数据存在base的model_data里</span></span><br><span class="line">    <span class="comment">//方便回调</span></span><br><span class="line">    base-&gt;model_data = iop_data;</span><br><span class="line">    </span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>上面就是在new函数里实现的一层一层函数指针的绑定，所以之后才可以调用对应的函数指针。</p>
<p>在iop_add 函数绑定成功后，整个iop_add_tcp_server流程走完了。</p>
<p>我们下一步看看如何<code>派发消息</code></p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">echo_server_test</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">int</span> keepalive_timeout = <span class="number">60</span>;</span><br><span class="line">    <span class="keyword">iop_base_t</span> *base = iop_base_new(<span class="number">10240</span>);</span><br><span class="line">    ... </span><br><span class="line">    iop_add_tcp_server(...,...);</span><br><span class="line">    ...</span><br><span class="line">    iop_run(base);</span><br><span class="line">    </span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p><code>iop_run函数完成消息轮询和派发</code></p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">iop_run</span><span class="params">(<span class="keyword">iop_base_t</span> *base)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">while</span>(base-&gt;exit_flag == <span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        iop_dispatch(base);</span><br><span class="line">    &#125;</span><br><span class="line">    iop_base_free(base);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>`<br>iop_dispatch消息派发函数</p>
<p>iop_base_free iop_base释放<br>`</p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">iop_dispatch</span><span class="params">(<span class="keyword">iop_base_t</span> *base)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">int</span> cur_id = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">int</span> next_id = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">int</span> r = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">iop_t</span> *iop = (<span class="keyword">iop_t</span> *)<span class="number">0</span>;</span><br><span class="line">    <span class="comment">//调用不同模型的函数指针实现消息派发</span></span><br><span class="line">    dispatch_imp_cb dispatch_cb = base-&gt;op_imp.base_dispatch;</span><br><span class="line">    r = (*dispatch_cb)(base,base-&gt;dispatch_interval);</span><br><span class="line">    <span class="keyword">if</span>( r == <span class="number">-1</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//检测定时器时间，定时调用</span></span><br><span class="line">    <span class="keyword">if</span>(base-&gt;cur_time &gt; base-&gt;last_time)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="comment">//check timers...</span></span><br><span class="line">        cur_id = base-&gt;timer_list_head;</span><br><span class="line">        <span class="keyword">while</span>(cur_id != <span class="number">-1</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            iop = base-&gt;iops + cur_id;</span><br><span class="line">            next_id = iop-&gt;next;</span><br><span class="line">            <span class="keyword">if</span>(base-&gt;cur_time &gt; iop-&gt;last_dispatch_time + iop-&gt;timeout)</span><br><span class="line">            &#123;</span><br><span class="line">                IOP_CB(base,iop,EV_TYPE_TIMER);</span><br><span class="line">            &#125;</span><br><span class="line">            cur_id = next_id;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        <span class="comment">/*********check for connect list.*********************/</span></span><br><span class="line"></span><br><span class="line">        cur_id = base-&gt;connect_list_head;</span><br><span class="line">        <span class="keyword">while</span>(cur_id != <span class="number">-1</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            iop = base-&gt;iops + cur_id;</span><br><span class="line">            next_id = iop-&gt;next;</span><br><span class="line">            <span class="keyword">if</span>(base-&gt;cur_time &gt; iop-&gt;last_dispatch_time + iop-&gt;timeout)</span><br><span class="line">            &#123;</span><br><span class="line">                IOP_CB(base,iop,EV_TYPE_TIMEOUT);</span><br><span class="line">            &#125;</span><br><span class="line">            cur_id = next_id;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="comment">//超时检测</span></span><br><span class="line">        <span class="comment">/*********clear keepalive, 60 seconds per times***********************/</span></span><br><span class="line">        <span class="keyword">if</span>(base-&gt;cur_time &gt; base-&gt;last_keepalive_time+<span class="number">60</span>)</span><br><span class="line">        &#123;</span><br><span class="line">            base-&gt;last_keepalive_time = base-&gt;cur_time;</span><br><span class="line">            cur_id = base-&gt;io_list_head;</span><br><span class="line">            <span class="keyword">while</span>(cur_id != <span class="number">-1</span>)</span><br><span class="line">            &#123;</span><br><span class="line">                iop = base-&gt;iops+cur_id;</span><br><span class="line">                next_id = iop-&gt;next;</span><br><span class="line">                <span class="keyword">if</span>(iop-&gt;timeout &gt; <span class="number">0</span> &amp;&amp; iop-&gt;last_dispatch_time + iop-&gt;timeout &lt; base-&gt;cur_time)</span><br><span class="line">                &#123;</span><br><span class="line">                    IOP_CB(base,iop,EV_TYPE_TIMEOUT);</span><br><span class="line">                &#125;</span><br><span class="line">                cur_id = next_id;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        base-&gt;last_time = base-&gt;cur_time;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> r;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p><code>这句代码是消息派发的关键</code></p>
<p>  //调用不同模型的函数指针实现消息派发<br>   <code>dispatch_imp_cb dispatch_cb = base-&gt;op_imp.base_dispatch;
    r = (*dispatch_cb)(base,base-&gt;dispatch_interval);</code></p>
<p><code>base-&gt;op_imp.base_dispatch之前在epoll_init里完成过初始化</code></p>
<p><code>其实调用的是epoll的dispatch</code></p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> <span class="title">epoll_dispatch</span><span class="params">(<span class="keyword">iop_base_t</span> * base, <span class="keyword">int</span> timeout)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">int</span> i;</span><br><span class="line">    <span class="keyword">int</span> id = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">iop_t</span> *iop = <span class="literal">NULL</span>;</span><br><span class="line">    <span class="comment">//iop_base中取出模型数据</span></span><br><span class="line">    <span class="keyword">iop_epoll_data_t</span> *iop_data = (<span class="keyword">iop_epoll_data_t</span> *)(base-&gt;model_data);</span><br><span class="line">    <span class="keyword">int</span> n = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">do</span>&#123;</span><br><span class="line">        n = epoll_wait(iop_data-&gt;epfd, iop_data-&gt;events, iop_data-&gt;nevents, timeout);    </span><br><span class="line">    &#125;<span class="keyword">while</span>((n &lt; <span class="number">0</span>) &amp;&amp; (errno == EINTR));</span><br><span class="line">    base-&gt;cur_time = time(<span class="literal">NULL</span>);</span><br><span class="line">    <span class="keyword">for</span>(i = <span class="number">0</span>; i &lt; n; i++)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="comment">//取出iop的id</span></span><br><span class="line">        id = (<span class="keyword">int</span>)((iop_data-&gt;events)[i].data.u32);</span><br><span class="line">        <span class="keyword">if</span>(id &gt;= <span class="number">0</span> &amp;&amp; id &lt; base-&gt;maxio)</span><br><span class="line">        &#123;</span><br><span class="line">            iop = (base-&gt;iops)+id;</span><br><span class="line">            <span class="comment">//这个宏是调用绑定在iop的事件回调函数（accept,read,write等）</span></span><br><span class="line">            IOP_CB(base,iop,from_epoll_events(iop_data-&gt;events[i].events));</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> n;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p><code>这句话完成绑定在iop的回调函数调用，基本功能就是accept，read或者write等</code></p>
<p>//这个宏是调用绑定在iop的事件回调函数（accept,read,write等）<br><code>IOP_CB(base,iop,from_epoll_events(iop_data-&gt;events[i].events));</code><br>这样就是整个libiop通讯流程和事件驱动机制</p>

      
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                    if(end > content.length){
                      end = content.length;
                    }
                    slicesOfContent.push(mergeIntoSlice(content, start, end, indexOfContent));
                  }

                  // sort slices in content by search text's count and hits' count

                  slicesOfContent.sort(function (sliceLeft, sliceRight) {
                    if (sliceLeft.searchTextCount !== sliceRight.searchTextCount) {
                      return sliceRight.searchTextCount - sliceLeft.searchTextCount;
                    } else if (sliceLeft.hits.length !== sliceRight.hits.length) {
                      return sliceRight.hits.length - sliceLeft.hits.length;
                    } else {
                      return sliceLeft.start - sliceRight.start;
                    }
                  });

                  // select top N slices in content

                  var upperBound = parseInt('1');
                  if (upperBound >= 0) {
                    slicesOfContent = slicesOfContent.slice(0, upperBound);
                  }

                  // highlight title and content

                  function highlightKeyword(text, slice) {
                    var result = '';
                    var prevEnd = slice.start;
                    slice.hits.forEach(function (hit) {
                      result += text.substring(prevEnd, hit.position);
                      var end = hit.position + hit.length;
                      result += '<b class="search-keyword">' + text.substring(hit.position, end) + '</b>';
                      prevEnd = end;
                    });
                    result += text.substring(prevEnd, slice.end);
                    return result;
                  }

                  var resultItem = '';

                  if (slicesOfTitle.length != 0) {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + highlightKeyword(title, slicesOfTitle[0]) + "</a>";
                  } else {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + title + "</a>";
                  }

                  slicesOfContent.forEach(function (slice) {
                    resultItem += "<a href='" + articleUrl + "'>" +
                      "<p class=\"search-result\">" + highlightKeyword(content, slice) +
                      "...</p>" + "</a>";
                  });

                  resultItem += "</li>";
                  resultItems.push({
                    item: resultItem,
                    searchTextCount: searchTextCount,
                    hitCount: hitCount,
                    id: resultItems.length
                  });
                }
              })
            };
            if (keywords.length === 1 && keywords[0] === "") {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-search fa-5x" /></div>'
            } else if (resultItems.length === 0) {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-frown-o fa-5x" /></div>'
            } else {
              resultItems.sort(function (resultLeft, resultRight) {
                if (resultLeft.searchTextCount !== resultRight.searchTextCount) {
                  return resultRight.searchTextCount - resultLeft.searchTextCount;
                } else if (resultLeft.hitCount !== resultRight.hitCount) {
                  return resultRight.hitCount - resultLeft.hitCount;
                } else {
                  return resultRight.id - resultLeft.id;
                }
              });
              var searchResultList = '<ul class=\"search-result-list\">';
              resultItems.forEach(function (result) {
                searchResultList += result.item;
              })
              searchResultList += "</ul>";
              resultContent.innerHTML = searchResultList;
            }
          }

          if ('auto' === 'auto') {
            input.addEventListener('input', inputEventFunction);
          } else {
            $('.search-icon').click(inputEventFunction);
            input.addEventListener('keypress', function (event) {
              if (event.keyCode === 13) {
                inputEventFunction();
              }
            });
          }

          // remove loading animation
          $(".local-search-pop-overlay").remove();
          $('body').css('overflow', '');

          proceedsearch();
        }
      });
    }

    // handle and trigger popup window;
    $('.popup-trigger').click(function(e) {
      e.stopPropagation();
      if (isfetched === false) {
        searchFunc(path, 'local-search-input', 'local-search-result');
      } else {
        proceedsearch();
      };
    });

    $('.popup-btn-close').click(onPopupClose);
    $('.popup').click(function(e){
      e.stopPropagation();
    });
    $(document).on('keyup', function (event) {
      var shouldDismissSearchPopup = event.which === 27 &&
        $('.search-popup').is(':visible');
      if (shouldDismissSearchPopup) {
        onPopupClose();
      }
    });
  </script>





  

  

  

  
  

  

  

  

</body>
</html>
